1089724421 has 2 divisors, whose sum is σ = 1089724422. Its totient is φ = 1089724420.

The previous prime is 1089724409. The next prime is 1089724439. The reversal of 1089724421 is 1244279801.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1085373025 + 4351396 = 32945^2 + 2086^2 .

It is an emirp because it is prime and its reverse (1244279801) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1089724421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1089724921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544862210 + 544862211.

It is an arithmetic number, because the mean of its divisors is an integer number (544862211).

Almost surely, 2^1089724421 is an apocalyptic number.

It is an amenable number.

1089724421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1089724421 is an equidigital number, since it uses as much as digits as its factorization.

1089724421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 1089724421 is about 33010.9742509972. The cubic root of 1089724421 is about 1029.0557283585.

The spelling of 1089724421 in words is "one billion, eighty-nine million, seven hundred twenty-four thousand, four hundred twenty-one".